Prasat Wat Sa Kamphaeng Yai 

Located in Wat Sa Kamphaeng Yai, Ban Kamphaeng Yai, Tambon Sa Kamphaeng Yai, it is the biggest and most perfect Khmer Ruins in the province. The Khmer Ruins comprises three stupas on the same base lining in North-South direction and facing east. The main stupa, at the middle, made from sandstone and bricks in some part, houses carved lintel depicting God Indra on the back of Erawan Heavenly Elephant above the Kiattimukha. Other two stupas are made of brick with sandstone decorations such as lintel, gable frame and door frame. Behind the southern stupa is another brick stupa. Before all are two brick vihara surrounded with walls made from laterite and sandstone and 4 Gopuras (doors) at all directions.

Brick vihara at north houses a carved lintel depicting Reclining Vishnu. The southern brick vihara houses a lintel depicting God Shiva and Goddess Uma seated on Nonthi Cow. Presently, this Khmer Ruins belongs to the division of Archeology, Fine Arts Department. Many antiques are found from this site such as lintels depicting Shiva God, Krissana God fighting Vattana Cow, Buddha statue in the attitude of meditation under naga, Buddha statue in attitude of meditation, and terra cotta Buddha images. 

By the style appearing on gables, lintels, and antique, particularly inscription at the doorframe of Sa Kamphaeng Yai Khmer Ruins, this ruins was probably build in the 11th Century with Bapuan Art style of Khmer. It was served as shrine for God Shiva before changing into Mahayana Buddhist temple in 13th Century.

How to get there: The Khmer Ruins is 26 kilometres from Si Sa Ket City and 2 kilometres from  Amphoe Uthumphon Phisai, via highway 226.